Machine Design
The objective of idler pulley in belt drive is to

All the above objectives
Decrease the tendency of belt to slip
Increase the wrap angle and belt tension
Increase the power transmission capacity

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Machine Design
A bolt of M 24 × 2 means that

The effective diameter of bolt is 24 mm and there are 2 threads per cm
The nominal diameter of bolt is 24 mm and pitch is 2 mm
Cross-sectional area of the threads is 24 mm²
The pitch of the thread is 24 mm and depth is 2 mm

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